Where do I put the film? Do I need a dark room?

Nobody is forcing. If you don't like it, find another job. But a requirement to be present in a meeting is not unreasonable, and camera on is a closer proxy to physically present than otherwise.

Remember what we did before the lockdown? Call-in meetings? No camera. This is the same thing, really but now we can do things like share screens. My team has one meeting we ask everyone to have their camera on - the sprint review. That's every two weeks and everybody is there with cameras on. Otherwise, nearly the whole team as their cameras off during meetings.

Yes it is unreasonable. Its the same as your employer installing cameras in your house to watch you.